These raw, unprocessed images of Saturn's moons Titan, Pallene, Dione and Rhea were taken on Oct. 14, 16 and 17, 2010. Clouds can be seen on Titan in the image of that moon. Cassini came within about 36,000 kilometers (22,000 miles) of Pallene; these are the highest resolution images of this small moon to be captured during the entire Cassini mission. Cassini passed within about 23,000 kilometers (14,000 miles) of Dione and about 31,000 (19,000 miles) kilometers of Rhea.

I think it's a coincident that it looks spherical. I don't think a small moon can be the that spherical, and considering Pallene is a shepherd moon, it probably has either a flying saucer-like shape, or an elongated egg-like shape... but i dunno

rnrnelson (Oct 23, 2010 at 2:57 PM):

Why is Pallene spherical? The October 18 closest approach yet of this 4km diameter moon shows a perfect sphere. Only if it were liquid (or recently liquid) could such a small object be so spherical. Why aren't 2001/2010 Space Odessey fans clamoring fo a mission to such an obviously alien artifact?